Roy Jimmy,
The only time that have seen a problem like this it was cured by fitting a ferrite bead on the ECU lead to the RX. The difference was dramatic.
However, what I do not understand is how you could have 20 flights before this problem occurred. Did you change anything at this point? The number one suspect in our jets is the pump motor. It is a perfect electrical noise generator. Try the ferrite bead you have nothing to loose.
Regards,

John.